Both the plate and chain cazic arms have ancient health on them. Whats up with leather having ancient fire? There are currently no other items with the focus in game, and seeing as you have to kill cazic for them, i dont think it would unbalance anything.
If the focus was available on another item i wouldnt be bothered. Before ldon came out, the elemental leather arms lacking a heal focus was also frustrating because it forced me to wear tov arms until i got elemental leather legs. So really im posting this in the hopes of getting focus effects streamlined for plate/chain/leather to avoid the problems i experienced in lower tiers.
Also, with the current itemization i would imagine the heal focus to be preferable for all leather classes.